> Immigration on Hacker News is like the dumbest topic here

"Dumbest" wouldn't be the word I'd use here, considering the views on immigration are sharply divided by education level. I reckon HN has an overrepresentation of people with (at least) a college degree, relative to the general population.

Ah, so these immigrants are indeed part of some sort of caliphate army — just one that was let in without a fight? Yes, that makes sense.

> Immigration on Hacker News is like the dumbest topic here.

Insert "We're All Trying To Find The Guy Who Did This" meme.